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Closed compound words are formed when two unique words are joined together. They don’t have a space between them and they are the type that generally comes to mind when we think of compound words.

Cannot	Baseball
Fireworks	Grandmother
Elsewhere	Upside

For example:²

Ice cream	Grand jury
Cave in	Post office
Real estate	Middle class

Open compound words have a space between the words but when they are read together a new meaning is formed:

One-half Mother-in-law Eighty-six One-third Merry-go-round Well-being

Hyphenated compound words are connected by a hyphen. To avoid confusion, modifying compounds are often hyphenated, especially when they precede a noun such as in the case of part-time teacher, high-speed chase, and fifty-yard dash. When they come after the noun they are open compounds: a chase that is high speed, a teacher that is part time, etc. Comparative and superlative adjectives are hyphenated when they are compounded with other modifiers: the highest-priced computer, the lower-priced car. Adverbs that end in –ly and compounded with another modifier are not modified: a highly rated restaurant, a publicly held meeting. Here are more examples of hyphenated compound words.